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Product Data SheetPDS 103-670.A01October, 2006 NGA
Heated NO/NOx Analyzer Module WetChemiluminescence Detection
(WCLD)
Visit our website at www.raihome.comOn-line ordering
available.
• Heated sample handling module for hot/wet gas samples
• Eliminates loss of NO2 in samplecondensate
• Built-in Peltier cooler removes moistureafter NO2
conversion
• Thermoelectrically cooled solid statedetector ensures high
stability
• Automated ozonator shut-off on loss ofair pressure
• Remote control and automaticcalibration capabilities
• On-line diagnostics• Efficient, interferent-free vitreous
carbon NO2 converter
Emerson's Rosemount Analytical NGA Wet Chemilumi-nescence
Detection Analyzer Module (WCLD) is theindustry's first modular
analyzer designed to meetstringent environmental regulations on NOx
emissions.The loss of NO2 due to solubility in sample
condensatetypically encountered in standard sample handlingsystems
has been eliminated. The WCLD's heatedsample conversion module is
designed to accept a hot/wet gas sample directly from the source.
Externalsample handling requirements are therefore minimized.
The WCLD is an extremely versatile instrument due tothe heated
sample conversion module. Applicationssuch as internal combustion
engine emissions (ICEE),continuous emissions monitoring systems
(CEMS) andNOx scrubber efficiency monitoring among others can
allbenefit from increased accuracy and simplified samplehandling
requirements associated with the WCLD.
The NGA WCLD Analyzer Module is a self-contained unitcomplete
with sample conversion, detection andassociated electronics. The
modulardesign allows for easy system integration, expandabilityand
flexibility. The WCLD Module may be a "standalone" instrument with
the addition of our Input/Output(I/O) Module and Platform or it can
be integrated into asophisticated multicomponent analysis
network.
What makes the NGA Analyzer family unique is themodular approach
combined with an advanced digitalcommunication network (LON). The
network allowsidentification of and interaction with other
analyzermodules in the analytical system. All pertinent
analyzeroutputs and diagnostic information is carried on thenetwork
to a centralized display panel on the platform orto a remote PC.
Because of this distinctive feature, theWCLD Analyzer Module may
either be incorporated intoa panel/rack or it can be placed near
the sample sourceup to a mile away, thereby further reducing
samplehandling requirements.
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FEATURESThe WCLD analyzer module is designed to meet
stringentU.S. Environmental Protection Agency requirements forNOx
monitoring. Increased accuracy is achieved overconventional NOx
analyzers by converting water solubleNO2 to NO in a heated sample
conversion module. Thishot NO2 to NO conversion eliminates the loss
of NO2 insample condensate. Moisture is then removed from thesample
gas before analysis in order to eliminate waterinterference with
the chemiluminescence reaction.
The WCLD analysis system consists of three separate
butinterconnected modules:
• Sample Conversion Module – accepts hot/wet samplegas and
converts NO2 to NO in a heated oven compart-ment. The vitreous
carbon NO2 converter provides highconversion efficiency and
minimizes interferent effects.The oven also contains sample
handling componentsto control sample pressure, bypass flowrate and
NO/NOx mode switching. A thermoelectric cooler thenremoves
condensibles from the sample gas.
• Chemiluminescence Detection Module – measuresconcentration of
NO in the conditioned sample gas.The module houses the
chemiluminescence reactionchamber, thermoelectrically cooled
detector, ozonegenerator and associated electronics.
• Platform – performs control unit functions with
operatorinterface. Analog/digital outputs, alarm contacts
anddigital inputs are available on the Input/Output (I/O)module
located inside the platform. One platform caninterface with several
other NGA analyzer modules likeCO, O2 and hydrocarbons, thereby
significantlyreducing installation and operating expenses.
Many new refinements have been added to the WCLD toenhance
overall performance. A new solid state (siliconphotodiode) detector
provides unsurpassed stability andlow maintenance. A two-stage
Peltier cooler maintainsthermal stability inside the detector
assembly to minimizesignal to noise ratio. An internal ozone
generator suppliesthe steady source of ozone required for the
chemilu-
FLOW DIAGRAM FOR WCLD MODULES
Conversion Module Detection Module
minescence reaction. A pressure switch automaticallyturns the
ozonator off in the event of loss of air pressureto prevent the
possibility of corrosion. A back pressureregulator ensures steady
sample pressure in the reactionchamber resulting in an ideal
chemiluminescencereaction.
The WCLD analyzer is equipped with four user-select-able ranges
and auto ranging capability. The analyzercan also be equipped with
an auto calibration cycle. Thedigital communication network (LON)
allows diagnosticsto be monitored while analyzers are in service to
antici-pate service requirements and minimize downtime.Information
like detector temperature, duty cycle, peak-peak noise, converter
temperature and power supplyvoltages, are carried on the network
between the analyz-ers and a remote platform or PC. In addition to
completeanalyzer operation on the network, I/Os are available inthe
platform providing analog outputs and external controlof analyzer
functions.
TYPICAL APPLICATIONSThe NGA WCLD analyzer can be used for a
variety ofapplications. Typical applications include:• NO/NOx
emissions from combustion of fossil fuels in:
– Vehicle engine exhaust (Meets EPA regulations forheavy duty
gasoline and diesel engine testing per40CFR, Part 86)
– Incinerators– Boilers– Gas appliances– Turbine exhaust
• Nitric acid plant emissions• Selective catalytic reduction
(SCR) process control and
efficiency monitoring• NO emissions from landfill
decomposition
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OUTLINE AND MOUNTING DIMENSIONSCONVERSION MODULE
OUTLINE AND MOUNTING DIMENSIONSDETECTION MODULE
Platform with Internal Analyzer Module Several analyzer modules
may be integrated with a single platform, either mountedinside or
located externally. (Platform shown here with top removed.)
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ANALYZER MODULE
PLATFORM
I/O MODULE(S)
l
l
l
l
A. Network cable connectionsB. 24 VDC power connectionC. FuseD.
Mounting feetE. Sample inletF. Gas exhaust
G. Sample outletH. Exhaust fanI. Exhaust liquidJ. Oven exhaust
vent and regulator adjustment accessK. Intake fan
FRONT VIEW
Dimensions:
INCHES
(MM)
Dimensions:
INCHES
(MM)
SIDE VIEW
REAR VIEW
A. Network cable connectionsB. 24 VDC power connectionC. FuseD.
Mounting feetE. Ozonator air
F. ExhaustG. Intake fanH. Sample inletI. Exhaust fan
FRONT VIEW
SIDE VIEW
REAR VIEW
A
BC
D
4.4(109)
8.4
(213)
6.0
(152)
1.1
(28)
22.4
(572)
K
F G H
I
E
J
.5
(13)1.3(33)
2.3
(58)4.4
(112)
2.2(56)
3.0(76)
2.8(71)
1.2
(30)
1.2(30)
4.4(109)
8.4
(213)
6.0
(152)
1.1
(28)
A
BC
D
17.5
(445)
.5(13) 1.3
(33)
EF
G
HI
1.3(33)
.9(23)
.9(23)
4.1
(104)
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For the following parameters, the conversion module willnot
degrade the performance of the companion detectionmodule:
– Repeatability
– Minimum detectable level
– Noise
– Linearity
– Response time
– Drift
– Effect of temperature
Sample RequirementsTemperature: 158°F (70°C) or less
Flow Rate: 750 to 2000 cc/min.
Pressure: 5 to 9 psig (344 to 620 hPa)
Particles: Filtered to < 2 microns
Moisture: Less than 15% water vapor by volume, noentrained
liquid
Materials in Contact with Sample: Stainless Steel,glass,
Teflon*, Kynar**
Physical SpecificationsCase Classification: General purpose for
installation inweather-protected area
Compliance: CSA-NRTL/C, RWTÜV, CE, C-TICK,NAMUR EMC
Maximum Separation: 1 mile (1600M) analyzer moduleto
platform
Dimensions: 4.4" H x 8.4" W x 22.4" D (109mm H x213mm W x 572mm
D)
Weight: 23.5 lbs. (10.7 kg)
Mounting: Custom-installed in a panel (not used in
aplatform)
Gas Connections:Sample In: 1/4" O.D. tube fitting, Stainless
Steel
Exhaust Gas: 1/4" O.D. tube fitting, Stainless Steel
Sample Out: 1/8" O.D. tube fitting, Stainless Steel
Exhaust Liquid: 1/4" O.D. tube fitting, Stainless Steel
Teflon* is a Registered Trademark of E.I. duPont de Nemours
& Co., Inc.
Kynar** is a Registered Trademark of Atochem North America,
Inc.
PRINCIPLE OF OPERATIONThe key benefit of the NGA WCLD Analyzer
Module isprevention of the loss of nitrogen dioxide (NO2) in
samplecondensate. This is achieved by bringing sample gasinto the
conversion module through a heated oven. Theoven houses the
vitreous carbon converter which isheated between 350°- 400°C. The
converter reduces NO2in the sample to nitric oxide (NO). The
vitrous carbonmaterial achieves conversion efficiency of over 95%
withlimited interferent effects. Any NO initially present in
thesample passes through the converter unchanged. A backpressure
regulator and metering valve are used to controlthe sample pressure
and flow rate. A thermoelectric coolerremoves moisture from the
sample stream immediatelyfollowing the oven. A peristaltic pump
drains all moistureremoved from the sample gas.
Dry sample gas then enters the detection module. Thedetection
module houses the ozone generator, thechemiluminescence reaction
chamber and the solid statephotodiode detector. The reaction
chamber operates atatmospheric pressure, thus eliminating the need
for abulky vacuum pump. The chemiluminescence reactioninvolves
following reactions:
NO + O3 = NO2* + O2 ..... (1)
NO2* = NO2 + hV (red light) ..... (2)
In reaction (1), nitric oxide (NO) and ozone (O3) readilyreact
to form nitrogen dioxide (NO2*) in an electricallyexcited state. In
reaction (2), the excited NO2* imme-diately reverts to the ground
state, emitting photons (redlight). This light is measured by the
photodiode detector.The intensity of the red light is directly
proportional to NOconcentration in the sample. Measurement
stability andlow noise levels are achieved by
thermoelectricallycooling the photodiode detector.
It is possible to measure NO concentration specificallyinstead
of the combined NO/NO2 or NOx concentration asdescribed above.
Selection of NO mode on the platformautomatically removes the
vitreous carbon converter fromthe sample path. Without the
converter, NO2 in thesample gas is not converted to NO and will not
participatein the chemiluminescence reaction. Therefore, only theNO
concentration will be measured.
CONVERSION MODULE
General SpecificationsMeasurement Species: NO, NOxRanges: 0 to
10 ppm through 0 to 10,000 ppm; 500 ppmNO2 maximum
Delay Time: 5 seconds, maximum (does not includeresponse time of
detection module)
Ambient Temperature: 50°F to 104°F (10°C to 40°C)
Power: 24 VDC ± 5%. 192 Watts
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DETECTION MODULE
General SpecificationsMeasurement Species: NO
Ranges: 0 to 10 ppm through 0 to 10,000 ppm NO withfour (4)
fullscale user selectable output ranges
Repeatability: ± 0.5% of fullscale(at constant temperature)
Minimum Detectable Level: 0.1 ppm
Noise: < 1% of fullscale, peak to peak
Linearity: ± 1% of fullscale
Response Time: < 1 sec. for 90% of fullscale for rangesof 25
ppm or greater
< 3 sec. for 90% of fullscale for ranges of less than
25ppm
(Does not include delay time introduced by conversionmodule)
Drift: (at constant temperature)
Zero – ± 1% of fullscale/24 hours, < 2% of fullscale/week
Span – ±1% of fullscale/24 hours, < 3% of fullscale/week
Effect of Temperature: < 2% of fullscale (over any
10°Cambient temperature variation interval for a rate of changeno
greater than 10°C/hour)
Ambient Temperature: 50° to 104°F (10° to 40°C)
Power: 24 VDC ± 5%, 70W
Ripple and noise: < 100 mVpp
Load regulations: < ± 1%
Sample RequirementsTemperature: 32° to 131°F (0°C to 55°C)
Flow Rate: Approximately 400 cc/min.
Pressure: 7 psig (± 2 psig), 482 hPa (± 138 hPa)
Particles: Filtered to < 2 microns
Dewpoint: 10°F (5.5°C) below ambient temperature, noentrained
liquid
Materials in contact with Sample: Stainless steel,Teflon*,
Kynar**
Ozonator Gas: USP breathing grade, dry air or oxygen;
Flow rate: 1 L/min.
Pressure: 10 to 15 psig (688 hPa to 1033 hPa)
Physical SpecificationsCase Classification: General purpose for
installation inweather-protected area
Compliance: CSA-NRTL/C, RWTÜV, CE, C-TICK,NAMUR EMC
Maximum Separation: 1 mile (1600m) analyzer moduleto
platform
Dimensions: 4.4" H x 8.4" W x 17.5" D (109mm H x213mm W x 445mm
D)
Weight: 18 lbs. (8.1 kg)
Mounting: Inside a platform (19" rack-mountable)
orcustom-installed in a panel
Gas ConnectionsOzone Air: 1/4" O.D. tube fitting, brass
Exhaust: 1/4" O.D. tube fitting, Stainless Steel
Sample: 1/8 O.D. tube fitting, Stainless Steel
Teflon* is a Registered Trademark of E.I. duPont de Nemours
& Co., Inc.Kynar** is a Registered Trademark of Atochem North
America, Inc.
The contents of this publication are presented for informational
purposes only, and while every effort has been made to ensure their
accuracy, they are not tobe construed as warranties or guarantees,
express or implied, regarding the products or services described
herein or their use or applicability. All sales aregoverned by our
terms and conditions, which are available on request. We reserve
the right to modify or improve the designs or specifications of
ourproducts at any time without notice.
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Model Description WCLD Process Wet NOx Converter and
Chemiluminescence Analyzer (WCLD)
Level 1 Language 0 English 1 German 2 French
Level 2 Software 2 Software 2.21 3 Software 3.3.x 6 Software
3.6.x 7 Software 3.7.x (till September 2005) 9 Actual Standard
Software 3.9.x A Software 2.3
Level 3 Configuration A1 Calibrated Low Ranges: 0-10, 0-25,
0-100, 0-250 ppm A2 Calibrated Low Ranges: 0-10, 0-30, 0-100, 0-300
ppm A3 Calibrated Low Ranges: 0-10, 0-50, 0-100, 0-500 ppm H1
Calibrated High Ranges: 0-250, 0-1000, 0-2500, 0-10000 ppm H2
Calibrated High Ranges: 0-300, 0-1000, 0-3000, 0-10000 ppm H3
Calibrated High Ranges: 0-500, 0-1000, 0-5000, 0-10000 ppm XX
Special (consult factory)
Level 4 Materials 1 With sample restrictor – for bypass flow
control 2 Without sample restrictor
Level 5 Flow Path 0 None Required 4 PS, 10 A, 24 VDC, for
cabinet mounting on supporting rails TS35 5 PS, 10 A, 230 VAC, 24
VDC, table-top version 6 PS, 10 A, 230 VAC, 24 VDC, rear panel
rack-mount 7 PS, 10 A, 120 VAC, 24 VDC, table-top 8 PS, 10 A, 120
VAC, 24 VDC, rear panel rack-mount A PS, 5 A, 24 VDC, for cabinet
mounting on supporting rails TS35 B PS, 5 A, 230 VAC, 24 VDC,
table-top version C PS, 5 A, 230 VAC, 24 VDC, rear panel rack-mount
D PS, 5 A, 120 VAC, 24 VDC, table-top E PS, 5 A, 120 VAC, 24 VDC,
rear panel rack-mount
Level 6 Special 0 None Required 5 Connection of AM with
table-top/rack PS, 1 m 6 Connection of AM with table-top/rack PS, 2
m 7 Connection of AM with cabinet PS, 1.5 m
Level 7 External Power Supply 0 None Required 4 PS, 10 A, 24
VDC, for cabinet mounting on supporting rails TS35 5 PS, 10 A, 230
VAC, 24 VDC, table-top version 6 PS, 10 A, 230 VAC, 24 VDC, rear
panel rack-mount 7 PS, 10 A, 120 VAC, 24 VDC, table-top 8 PS, 10 A,
120 VAC, 24 VDC, rear panel rack-mount F PS, 20 A, 120 VAC, 24 VDC,
for cabinet mounting on supporting rails G PS, 20 A, 120 VAC, 24
VDC, for cabinet mounting on supporting rails
ORDERING INFORMATION
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Level 8 Power Supply Cable 0 None Required 5 Connection of AM
with table-top/rack PS, 1 m 6 Connection of AM with table-top/rack
PS, 2 m 7 Connection of AM with cabinet PS, 1.5 m
Option Notes Level 3: Option: A1, A2, A3, H1, H2, H3
Ranges indicated within the configuration identifier are
standard. Non-standard ranges within the identifier can bechanged
by the user or factory calibrated for an additional charge.
Indicate an "X" in the last position and specify ranges.
Level 5: Option: 0A power supply for WCLD (Detection AM)
required.10 A Power supply for WNOx (Conversion AM) required
Level 7: Option: 0Cabinet Power Supply, 10 A, manual switch: 120
VAC or 230 VACPower Supply, 20 A, Cabinet mount: BxHxT=227 mm x 125
mm x 103 mmPower Supply, Rack-mount: 3 HU, B=141.9 mm
Page 7
AccessoriesPart Number Description 748313 Manual W-CLD
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© Rosemount Analytical Inc., 2006. All rights reserved.Printed
in U.S.A. on recycled paper.
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GAS CHROMATOGRAPHY CENTERAND LATIN AMERICAEmerson Process
ManagementRosemount Analytical Inc.11100 Brittmoore Park
DriveHouston, TX 77041T 713 467 6000F 713 827 3329
WORLD HEADQUARTERSEmerson Process ManagementRosemount Analytical
Inc.6565 P Davis Industrial ParkwaySolon, OH 44139 USAT
440.914.1261Toll Free in US and Canada800.433.6076F
440.914.1271e-mail: [email protected]
